--The present paper addresses the practical implementation in a test bench of different control strategies for the start-up of a varspeed group in pump mode. In varspeed groups using a double-fed induction machine supplied by back to back voltage source inverters (VSI), the possibility exists of using the rotor side VSI to start up the group. The current paper focuses on the start-up strategy and its implementation in a test bench of 3.3 kVA. After presenting the hardware composing the test bench, two different start-up strategies are detailed, which are the field oriented control and critical torque. Those two strategies are then implemented in practice, tested, measured and compared.Index Terms -varspeed group, start-up, variable speed drives, control systems, double-fed induction machine, AC-DC power converters, field oriented control.

The present paper addresses the speed control of a DC machine in the context of an advanced teaching lab consisting in setting up an islanded production unit. The different steps followed by the student to design and implement the speed control of the DC machine used in this islanded production unit are explained. A hardware specifically designed for this teaching and consisting of a DSP and an Analog to Digital (A/D) converter is presented. The major steps for the design of the PI (Proportional-Integral) regulator are recalled, whereas different improvement techniques such as the Anti-Reset Windup (ARW) or the set value corrector are presented in details. The corresponding code implemented in a DSP is given and detailed. Different tests performed on the test bench are then discussed mainly in terms of response time and overshoot.